US specialists at the Joint Force Space Component Command said they had used orbit analysis technology to confirm Tiangong-1's re-entry.
Thirteen space agencies, under the leadership of the European Space Agency, used radar and optical observations to follow Tiangong's path around the globe.
China has launched a second lab, Tiangong-2, which continues to be operational. It was visited by a re-fuelling freighter, Tianzhou-1, just last year.
